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DS3800HIOA1C1E

DS3800HIOA1C1E

价格:562元浏览:318次联系:吴巧燕 / 平博体育网址 / 0592-5085207企业:厦门岳航计算机工程有限公司留言店铺收藏


联系人:吴巧燕 

Tell:0592-5085207   18030132585

Q Q:  2774168327
 三大承诺:
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3、绝对保证售后服务质量
通讯系统的建设是配电自动化系统的关键之一。配电自动化系统需要借助于有效的通讯手段,将控制中心的控制命令准确地传送到为数众多的远方终端,并且将反映远方设备运行情况的数据信息收集到控制中心。本文结合配电网自动化的特点和要求, 对光纤、现场总线、配电线载波、无线通信等多种通信方式进行了综合分析和比较, 探讨了适合配电网自动化的通信方式, 为配电网自动化通讯方式的选择提供了参考。

随着我国经济的发展和城市优乐国际网页版化进程的加快,电力负荷日益增加,用户对供电的可靠性和质量的要求越来越高。配电网自动化已逐渐成为电力系统自动化领域的新兴热点。要实现配电网自动化,通信是一个关键环节。配电网自动化系统需依靠有效的通信手段,将控制中心命令准确地传送到众多的远方终端,并且将反映远方设备运行状况的数据信息收集到控制中心。由于配电网设备数量大、种类多、分布广,如何在满足供电可靠性的基础上,选择适合我国配电网现状并满足用户需求的可靠而经济的通信方式显得至关重要。

1 配电自动化对通信系统设计要求

配电自动化系统一般分为3部分, 即配电主站、配电子站、配电远方终端。配电主站是整个配电自动化系统的监控、管理中心; 配电子站具有实现所辖范围内的信息汇集、处理, 以及故障处理、通信监视等功能; 配电远方终端用于各种远方监测和控制。三者之间的信息交互依靠通信系统完成,配电自动化对通信系统的要求体现在以下6个方面:

( 1)通信可靠性 通信系统在户外工作, 应能承受雨、雪、冰雹、狂风、暴雨等恶劣的气候条件, 应能抵抗电磁干扰;

( 2)经济性 通信系统的先进性与建设费用是矛盾的, 应该选择先进性与建设费用的最佳组合, 使其性价比最高;

( 3)满足数据传输速率的要求 通信系统不仅要能满足目前的需要, 还应该考虑将来增长的需要;

( 4)双向通信的要求 应满足配电自动化系统在功能上具备双向通信的要求, 也应该满足通信的实时性需求;

( 5)停电和故障区域正常工作 在停电和发生故障的情况下通信不受影响, 能正常工作;

( 6)操作与维护方便 由于配电自动化系统十分庞大, 通信系统相当复杂, 应尽量使用具有通用性标准化的设备, 以方便操作与维护.

2 配电自动化通信系统方案

在实施配电自动化系统设计建设中, 对于通讯方式和设备的选择应适当超前考虑, 既要考虑它的先进性和可靠性, 又要考虑当地的经济现状和发展前景, 兼顾其经济性和合理性。

目前, 配电自动化通信方案主要基于有线技术和无线技术两大类。 有线通信技术包括IP, 光纤, 配电线载波, 现场总线; 无线通信技术包括无线局域网, 微波, 无线扩频和窄带, GPRS和GSM短信, 无线广播。

2.1有线通信方式

2.1.1专线

专线通常采用双绞线或音频电缆, 各用户端在与终端设备通信的过程中采用的是polling 方式,通过Modem将数字信号转换成模拟信号在专线上传送, 可实现不小于1 200 b it / s和不低于10 km的通信, 但其传输速率低, 运行维护费用高。

市话网

利用市电话网组成配网通信系统, 其特点是不需要投资建设专用通信网, 开通费用低, 但运行费用高。

2.1.3 配电线载波

配电线载波通信是利用已有的电力架空明线或地埋电缆通过配电载波设备来传递语音和数据,其优点是:

1) 利用现有的配电线路传输不需另铺专用通信线路, 能连接电网关心的任何测控点;

2)其安全性为电力部门所控制, 因而便于管理。

其缺点是: 数据传输速率较低; 容易受到干扰、非线性失真和信道间交叉调制的影响。除了传统的电力载波, 目前采用扩频载波或正交频分复用技术的配电线载波也有所应用, 其特点是能在传统载波机无法开通的线路上稳定工作,具有长距离中继等功能, 主要应用于路线长、面积广的农网配电网自动化系统及无法敷设通信线路的特殊场合。

2.1.4 光纤通信

光纤通信是以光波作为信息载体的通信手段,目前常用光纤环网和光纤以太网方式, 主要特点是速率高、稳定性好、抗干扰能力强、保密性好、组网方式灵活, 可以实现综合数据传输, 但投资大。随着光缆技术的进步、光缆性价比的提高, 光纤通信在配电网自动化系统中将被广泛采用。

2.1.5 现场总线和RS- 485

现场总线是连接智能现场设备和自动化系统的数字式双向传输、多分支结构的通信网络。在配电网自动化系统中, 现场总线适合于站内自动化能模块之间的通信。RS- 485是一种改进的串行接口标准, 最多可支持64~ 256个发送/接收器, 其功能和安全性都能满足基本要求(如输入输出隔离、防静电、防雷击、微功耗等) , 具有通信效率高、可靠性好等优点, 但用于大容量系统时, 需铺设专用线路, 工程造价较高。

2. 2无线通信方式

无线通信系统具有覆盖面广、无需传输线、能在停电区域保持通信等特点。

2. 2. 1 基于无线局域网技术的通信方案

无线局域网技术采用无线电或红外线作为传输媒介, 利用扩频或窄带调制方式进行调制发射.它以无线信道作为传输媒介, 能支持较高的数据传输速率, 具备无线通信能力的智能终端可以在子站与远端设备间构建无线局域网, 能实现实时数据的采集和设备的控制.运用无线局域网技术, 给出了通信系统的解决方案.

2. 2. 2 微波中继通信方案

微波是指频率大于1 GH z的电波. 微波传输距离长、传输容量大、稳定性能好, 但微波只能在可视范围内沿直线传播, 绕射能力差, 是点到点的通信技术, 不适合多点通信. 若传输距离大于50km 或通信两点之间有遮挡时, 需要增加中继器[ 4, 5] . 微波中继通信由微波收发信机、微波线路和天线组成. 微波通信的缺点是受气候、地理条件影响比较大, 同时还需要向无线电管理委员会申请频率.


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NEW TRAVAINI GUA.B2C.000.00M GASKET KIT D436978
 
NEW PHILIPS 705B-60L SPRING 33X26X100X4MM D252354
 
NEW HOERBIGER-ORIGA P-120 SERVICE PACK PNEUMATIC CYLINDER D380922
 
NEW INGERSOLL RAND 052776-00 STEEL PUMP SHAFT SLEEVE D495368
 
NEW PBM 3 IN BALL VALVE SEAL KIT REPLACEMENT PART D424112

NEW FALK 707189 100-1100T10 STEELFLEX SEAL KIT COUPLING REPLACEMENT PART D476482
 
NEW MORSE 175H-TAK XD9005 TORQUE ARM FOR REDUCER KIT REPLACEMENT PART D294597
 
NEW 31414-001 OUTPUT STEEL SHAFT 12IN LONG 2IN DIA D241641
 
NEW AMIAD 81-41-4561-0003 DIAPHRAGM M102C/104C 4-3/4IN OD REGULATOR B254664
 
NEW DODGE 23PLUGIN TIGEAR-2 PLUGIN SHAFT SIZE 23 D504457
 
NEW CHESTERTON 98778 1-1/2IN PUMP LABYRINTH SEAL REPLACEMENT PART D408496
 
NEW NUMATICS 204-270 END CAP EXTENDED KNURLED ROD MARK 8 D212987
 
NEW FISHER 11A5238X012 STEEL VALVE PLUG D489291
 
NEW MCMASTER-CARR 98411A660 1/4 - 1-5/8IN SNAP RING KIT D508838
 
NEW WOLF-TEC S15321 CRANK ARM 55MM BORE D430765
 
NEW REIMELT SILICONE 3 IN VALVE SEAT REPLACEMENT PART B435375
 
NEW G&H 96111992137 VALVE O-RING EPDM REPLACEMENT PART D303572
 
NEW TIPPER TIE 3026-2071 16-1/4 L ROLLER CONVEYOR REPLACEMENT PART D212604
 
NEW NORD 5087301.0 STEEL HELICAL SPUR GEAR D368146
 
NEW FISHER 2P330846622 CONTROL VALVE STEEL CAGE D497720
 
NEW FISHER 16A7844X012 VALVE SEAT STAINLESS REPLACEMENT PART D301076
 
NEW WAUKESHA FM1-3-01-316 PIPING STRAINER CONNECTION TRI-CLAMP STAINLESS D390858
 
NEW LESLIE CONTROLS 6-1/2IN 1IN OD MAIN VALVE SHAFT STEEL D476285
 
NEW FALK 931366 SEAL KIT 90T 20 REPLACEMENT PART D474148
 
NEW ALVEY 6101516 7/16IN HEX BORE 29X1-1/2IN ROLLER CONVEYOR D415478
 
NEW NATEC 1112627 STAINLESS BEARING HOUSING 1-1/4 IN ID REPLACEMENT PART D435169
 
NEW APV M03SS428548 #3 NITRILE PUMP ROTOR REPLACEMENT PART D377990
 
NEW DELTROL SL30 SLIDE VALVE 1/2 IN NPT HYDRAULIC FITTING D331186
 
NEW LINCOLN SL-44 83749-5 CENTRO-MATIC LUBRICATOR 1/8 IN NPT REPLACEMENT D383218
 
NEW APV 03308 VALVE STOPPER 2IN OD STAINLESS REPLACEMENT PART D299948
 
NEW SPIRAX SARCO MFP 14 1360880 COVER GASKET SET REPLACEMENT PART B452208
 
NEW ARPAC 101994.008 STEEL IDLER 27-1/2X2IN 1IN ID CONVEYOR ROLLER D247490
 
NEW 2-7/16 IN OD 10-1/2 IN TOTAL LENGTH STAINLESS VALVE STEM D424945

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